Digital reflection densitometer system
US4053235A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1973 |
| Grant date | Oct 11, 1977 |
| Priority date | — |
| Expiry date | Apr 27, 1993 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/474
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital reflection densitometer system comprises a power supply unit and a digital reflection densitometer instrument which is connected to the power supply unit by means of an electrical cable. The instrument is manually positionable over a surface and includes a housing which is supported on a foot. The foot is adapted for engagement with the surface and includes target apparatus for designating a predetermined area of the surface. The housing is normally pivotally separated from the foot by a spring and is manually pivotable to an operating position adjacent the foot. A plurality of lamps are mounted in the housing for illuminating the predetermined area of the surface when the housing is in the operating position. Light reflected from the predetermined area is directed through an optical system to a light sensitive apparatus comprising a planar silicon sensor. The output of the planar silicon sensor is directed through an operational amplifier and a logarithmic amplifier to a digital volt meter which actuates a digital display device mounted in the housing of the instrument to provide a visual digital readout indicative of the output of the planar silicon sensor. The instrume…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.